Question 1

Plant viruses may be transmitted by

Accepted Answer

A)  worms.
B)  contaminated seeds.
C)  humans.
D)  insects.
E)  All of the choices are correct.

Question 2

Transduction often involves defective virus.

Accepted Answer

A) True 
 B)False

Question 3

What are two ways that phage can replicate in harmony (not directly lysing) their host cell?

Accepted Answer

A)  Conjugation and lysogeny
B)  Lysogeny and transduction
C)  Extrusion and transformation
D)  Extrusion and lysogeny

Question 4

Enveloped viruses

Accepted Answer

A)  just require a stamp.
B)  have an outer lipid bilayer membrane containing various proteins.
C)  are surrounded by an additional layer of carbohydrate.
D)  envelope a cell.

Question 5

Phages that can either replicate and cause cell lysis or can integrate their DNA into the host DNA are called

Accepted Answer

A)  lysogenic phages.
B)  lytic phages.
C)  virulent phages.
D)  segmented phages.

Question 6

The clustered,regularly interspaced short palindromic repeats (CRISPR) system in bacterial cells has been called the "immune" system of bacteria.CRISPR protect bacteria from a repeat infection from the same phage because bacterial cells

Accepted Answer

A)  recognize proteins on the surface of the phage and secrete enzymes that digest the phage.
B)  recognize proteins on the surface of the phage and secrete proteins that block the binding of the phage.
C)  integrate fragments from the phage DNA in their own chromosomes and target for destruction any DNA that contains the same fragments in the future.
D)  modify the attachment sites for the phages so that new infections cannot take place.

Question 7

The term filterable viruses was coined by

Accepted Answer

A)  Beijerinck.
B)  Iwanowsky.
C)  Twort.
D)  d'Herelle.

Question 8

DNA is protected from restriction enzymes by being

Accepted Answer

A)  sequestered in a lysosome.
B)  turned into RNA.
C)  methylated.
D)  made into double-stranded RNA.

Question 9

All viruses must separate the nucleic acid from the capsid before replication.

Accepted Answer

A) True 
 B)False

Question 10

Normal tissue taken from animals and prepared immediately as media for viral growth is termed a(n)

Accepted Answer

A)  advantageous group.
B)  monolayer culture.
C)  plaque.
D)  primary culture.

Question 11

Animal viruses are divided into a number of families whose names end in

Accepted Answer

A)  -virus.
B)  -viridae.
C)  -viscous.
D)  -eieio.

Question 12

The replicative form of nucleic acid in filamentous phages is

Accepted Answer

A)  dsDNA.
B)  dsRNA.
C)  positive ssRNA.
D)  negative ssDNA.

Question 13

Retroviruses are unique in that they

Accepted Answer

A)  replicate in nervous system cells.
B)  do not have a capsid.
C)  use RNA as a template to make DNA.
D)  use DNA as a template to make RNA.

Question 14

The correct order for the stages of a phage infection is:

Accepted Answer

A)  penetration,transcription,attachment,replication of nucleic acid and protein,assembly,release.
B)  attachment,penetration,transcription,replication of nucleic acid and protein,assembly,release.
C)  attachment,replication of nucleic acid and protein,penetration,transcription,assembly,release.
D)  transcription,attachment replication of nucleic acid and protein,assembly,penetration,release.

Question 15

The viral envelope closely resembles the

Accepted Answer

A)  prokaryotic cell wall.
B)  capsomere.
C)  eukaryotic cellular membrane.
D)  cytoplasm.

Question 16

What part of the attached bacteriophage enters through the host cell wall?

Accepted Answer

A)  The entire virus
B)  Only the enzymes necessary for replication
C)  The nucleic acid
D)  The nucleic acid and capsid
E)  The capsid only

Question 17

The genome of retroviruses is made of

Accepted Answer

A)  ssDNA.
B)  dsDNA.
C)  ssRNA.
D)  dsRNA.

Question 18

A limiting factor for viral infection is

Accepted Answer

A)  internal metabolic temperature of the host cell.
B)  nutrition of the host cell.
C)  stage of cell cycle of the host cell.
D)  presence of specific receptor molecules on the host cell.

Question 19

Bacteriophage,unlike animal viruses,often have special viral-specific enzymes carried in the capsid,which enter the host cell at the same time as the nucleic acid.

Accepted Answer

A) True 
 B)False

Question 20

The concentration of virus that infects or kills 50% of the host cells is referred to as the

Accepted Answer

A)  LD50.
B)  ID50.
C)  ID100.
D)  LD100.
E)  LD50 AND ID50.

Exam 13: Viruses, Viroids, and Prions

The correct order for the stages of a phage infection is:

Correct AnswerverifiedShow Answer

DNA is protected from restriction enzymes by being

Correct AnswerverifiedShow Answer

The genome of retroviruses is made of

Correct AnswerverifiedShow Answer

The term filterable viruses was coined by

Correct AnswerverifiedShow Answer

Enveloped viruses

Correct AnswerverifiedShow Answer

The replicative form of nucleic acid in filamentous phages is

Correct AnswerverifiedShow Answer

The concentration of virus that infects or kills 50% of the host cells is referred to as the

Correct AnswerverifiedShow Answer

The viral envelope closely resembles the

Correct AnswerverifiedShow Answer

The clustered,regularly interspaced short palindromic repeats (CRISPR) system in bacterial cells has been called the "immune" system of bacteria.CRISPR protect bacteria from a repeat infection from the same phage because bacterial cells

Correct AnswerverifiedShow Answer

Plant viruses may be transmitted by

Correct AnswerverifiedShow Answer

What part of the attached bacteriophage enters through the host cell wall?

Correct AnswerverifiedShow Answer

Animal viruses are divided into a number of families whose names end in

Correct AnswerverifiedShow Answer

What are two ways that phage can replicate in harmony (not directly lysing) their host cell?

Correct AnswerverifiedShow Answer

Phages that can either replicate and cause cell lysis or can integrate their DNA into the host DNA are called

Correct AnswerverifiedShow Answer

Transduction often involves defective virus.

Correct AnswerverifiedShow Answer

Normal tissue taken from animals and prepared immediately as media for viral growth is termed a(n)

Correct AnswerverifiedShow Answer

Retroviruses are unique in that they

Correct AnswerverifiedShow Answer

Bacteriophage,unlike animal viruses,often have special viral-specific enzymes carried in the capsid,which enter the host cell at the same time as the nucleic acid.

Correct AnswerverifiedShow Answer

A limiting factor for viral infection is

Correct AnswerverifiedShow Answer

All viruses must separate the nucleic acid from the capsid before replication.

Correct AnswerverifiedShow Answer

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